Granted Patent
Utility
US 4,152,259 · App. 05/863,587
Backflushing method
Inventor:
Allen E. Molvar
Patented Case
View Patent ↗
Granted: May 1, 1979
Filed: Dec 22, 1977
Inventor
Allen E. Molvar
Assignee (at issue)
Clevepak Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.